Data processing system





1. IN A DATA PROCESSING SYSTEM ADAPTED TO EXECUTE IN SEQUENTIAL ORDER A PLURALITY OF DISCRETE OPERATIONS IN RESPONSE TO A CORRESPONDING SEQUENCE OF COMMAND ITEMS STORED A SEQUENTIAL IN A FIRST REGISTER, WHEREIN AN ADDRESS ITEM FOR CAUSING INSERTION OF THE NEXT SEQUENTIAL COMMAND ITEM IN SAID FIRST REGISTER IS PROVIDED DURING EACH ONE OF SAID OPERATIONS; THE COMBINATION, COMPRISING, A SECOND REGISTER, INHIBITING MEANS FOR CAUSING SAID DATA PROCESSING SYSTEM TO DISCONTINUE EXECUTING OPERATIONS, AND MEANS RESPONSIVE TO THE DISCONTINUANCE OF EXECUTION OF OPERATIONS FOR STORING IN SAID SECOND REGISTER THE ONE ADDRESS ITEM PROVIDED DURING THE LAST OF SAID OPERATIONS EXECUTED BEFORE SAID DISCONTINUANCE. 